Backlight module having non-dot area and light guide plate using same

Abstract

A light guide plate includes a light mixing part and a visual part. The light mixing part includes a light mixing bottom surface, a light incident surface, and a top surface opposite to the light mixing bottom surface. The light incident surface is substantially perpendicular to the light mixing bottom surface and the top surface. The visual part is adjoined to the light mixing part and includes a visual bottom surface and a light emitting surface opposite to the visual bottom surface. The visual bottom surface and the light mixing bottom surface are substantially coplanar and are divided by an imaginary adjoining line. The top surface and the light emitting surface are substantially coplanar. The visual bottom surface has at least one non-dot area. The visual bottom surface forms a plurality of reflective dots except for the non-dot area.

What is claimed is: 
     
         1 . A light guide plate comprising:
 a light mixing part comprising a light mixing bottom surface, a light incident surface, and a top surface opposite to the light mixing bottom surface, the light incident surface being perpendicular to the light mixing bottom surface and the top surface; and   a visual part adjoining to the light mixing part, the visual part comprising a visual bottom surface and a light emitting surface opposite to the visual bottom surface, the visual bottom surface and the light mixing bottom surface being coplanar to each other and being divided by an imaginary adjoining line, the top surface and the light emitting surface being coplanar, the visual bottom surface having at least one non-dot area, the visual bottom surface forming a plurality of reflective dots except for the non-dot area.   
     
     
         2 . The light guide plate of  claim 1 , wherein visual part is a flat plate. 
     
     
         3 . The light guide plate of  claim 1 , wherein the non-dot area is semi-circular, and a straight edge of the non-dot area is collinear with the imaginary adjoining line. 
     
     
         4 . The light guide plate of  claim 1 , wherein the light mixing part is a prism. 
     
     
         5 . The light guide plate of  claim 1 , wherein the light mixing part is a cube. 
     
     
         6 . A backlight module comprising:
 a light guide plate comprising:
 a light mixing part comprising a light mixing bottom surface, a light incident surface, and a top surface opposite to the light mixing bottom surface, the light incident surface being perpendicular to the light mixing bottom surface and the top surface; and 
 a visual part adjoining to the light mixing part, the visual part comprising a visual bottom surface and a light emitting surface opposite to the visual bottom surface, the visual bottom surface and the light mixing bottom surface being coplanar to each other and being divided by an imaginary adjoining line, the top surface and the light emitting surface being coplanar to each other, the visual bottom surface having at least one non-dot area, the visual bottom surface forming a plurality of reflective dots except for the non-dot area; and 
 at least one light source adjacent to the light incident surface and aligned with the non-dot area. 
   
     
     
         7 . The backlight module of  claim 6 , wherein visual part is a flat plate. 
     
     
         8 . The backlight module of  claim 6 , wherein the non-dot area is semi-circular, a straight edge of the non-dot area is collinear with the imaginary adjoining line, and a length of the straight edge is 1 to 1.5 times the width of the light source. 
     
     
         9 . The backlight module of  claim 6 , wherein the light mixing part is a prism, the number of the light source is one, and the number of the non-dot area is one. 
     
     
         10 . The backlight module of  claim 6 , wherein the light mixing part is a cube, the number of the light source is more than one, and the number of the non-dot area is equal to the number of the light source. 
     
     
         11 . The backlight module of  claim 6 , wherein the light source is light emitting diode. 
     
     
         12 . The backlight module of  claim 6 , further comprising a shield part completely covering the top surface for preventing light emitted out from the top surface.